1994586609 has 4 divisors (see below), whose sum is σ = 2659448816. Its totient is φ = 1329724404.

The previous prime is 1994586569. The next prime is 1994586619. The reversal of 1994586609 is 9066854991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9066854991 = 3 ⋅3022284997.

It is not a de Polignac number, because 1994586609 - 2²³ = 1986198001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1994586619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332431099 + ... + 332431104.

It is an arithmetic number, because the mean of its divisors is an integer number (664862204).

Almost surely, 2^1994586609 is an apocalyptic number.

It is an amenable number.

1994586609 is a deficient number, since it is larger than the sum of its proper divisors (664862207).

1994586609 is an equidigital number, since it uses as much as digits as its factorization.

1994586609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664862206.

The product of its (nonzero) digits is 4199040, while the sum is 57.

The square root of 1994586609 is about 44660.7949884460. The cubic root of 1994586609 is about 1258.7832818674.

The spelling of 1994586609 in words is "one billion, nine hundred ninety-four million, five hundred eighty-six thousand, six hundred nine".